﻿IV PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [vol. lxxii, 



Ampullaria ovata Olivier. Locality. -Lak Buna. 



Distribution. — Recent: Victoria Nyanza, Tanganyika. ^STile ; post- 

 Pliocene: Egypt ; Miocene: Victoria Nyanza. 



Melania tuberculata (Midler) (=curvicosta Deskayes). Localities. — 

 Archer's Post ; Lak Buna ; Chikali Khofu. 



Distribution. — Recent: Nile, Rudolf. Nyasa, Tanganyika. India, etc. ; 

 post- Pliocene : Egypt and Sahara ; Pliocene: Lake Assal, French 

 Somaliland (formerly regarded as Abyssinia) ; Miocene : Rudolf (Omo 

 River), Greece, North Italy, etc. 



Cleopatra bulimoides (Olivier). Localities. — Lak Buna; Chikali 

 Khofu. 



Distribution. — Recent: Nile, Rudolf, French Somaliland. Zanzibar; 

 post-Pliocene: Egypt ; Pliocene: French Somaliland; Miocene: 

 Victoria Nyanza. 



Bythinia and Planorbis spp. Locality. — Waihir. 



Limicolaria RECTIstrigata E. A. Smith. Locality. — Archer's Post. 

 Distributio n. — R e c e n t : Rudolf and Tanganyika regions. 



Rhachis rhodot^nia Martens. Locality.— Chikali Khofu. 

 Distribution. — Recent : Victoria Nyanza and Mount Kenya plateau. 



Leptospatha spathuliformis (Bourguignat). Localities. — Turbi and 

 Lak Buna. 



Distribution. — Recent: Rudolf and Zanzibar. 



Corbicula fluminalis (Midler) ( = saharica Fischer). Localities. — - 

 Turbi, Lak Buna, Chikali Khofu. 



Distribution. — Recent: Nile, Rudolf, Marguerite, and Abyssinia; 

 post-Pliocene: Egypt and Sahara; Pliocene: French Somaliland; 

 Miocene: Rudolf (Omo River). 



Corbicula radiata (—pusilla?) Philippi. Locality. — Chikali Khofu. 



Distribution. — Recent: Nile, Rudolf , Victoria Nyanza, Albert Edward, 

 Nyasa, Tanganyika ; post-Pliocene: Egypt ; Pliocene: French Somali- 

 land; Miocene: Rudolf (Omo-River beds). 



No vertebrates occurred with these shells, hence their age would 

 probably be younger than the Omo-Piiver deposits north of Lake 

 Rudolf, that have yielded a somewhat similar molluscan fauna, 

 but with the addition of DinotJierium and other vertebrate remains. 

 The presence of that genus, as pointed out by Dr. Haug, 1 was 

 indicative of the Pontian or Upper Miocene Period. There are, 

 however, some lacustrine beds near Lake Assal, in French Somali- 

 land (formerly regarded as Abyssinia), which contain shells also 

 bearing a resemblance to those collected by Mr. Parkinson in 

 British East Africa, especially JSLelania tuberculata, Cleopatra 

 bulimoides, Corbicula fluminalis, and C. radiata, which are com- 

 mon to both sets of deposits. These Lake- Assal beds, which are 

 also without vertebrate remains, have been identified by Aubry, 2 



1 ' Traite de Geologie ' vol. ii (1908-11) p. 1727. 



- Bull. Soc. Geol. France, ser. 3. vol. xiv (18S5) pp. 206-209. 



